Experimental Physics and
Industrial Control System

Peter Milne <[email protected]> · Sat, 22 Nov 2014 18:32:35 +0000

Hello Tech-talk

Developing an OPI for a multi channel DAC output device in DC mode

(D-TACQ AO420FMC-4/ACQ424-32):

In the IOC:
- there's an AO record for each channel

- each channel has a gain control, so that the output range changes,

from, say +/-5V to +/-10V, this is represented by an MBBO record.

- a short bit of SNL monitors the gain change and changes the AO record

limits (HOPR, LOPR, ESLO) so that the PV is rescaled on the fly.

.. This works very well.

In the CSS/BOY OPI there's a Scaled Slider to control each AO. There's a

menu button to set the gain for each channel. However, when the gain is

changed, the Slider does not rescale automatically.

That's understandable, it's probably unreasonable to expect the widget

to monitor _all_ the fields in the PV. On a Linux desktop, F5 "Refresh

OPI" causes the widget to update and the scale changes correctly.

Q1: I'd like to hook a javascript to the gain menu button to call

"Refresh OPI" so that the slider rescales automatically. It's not

obvious how to do this. If javascript can't call the refresh method,

perhaps it could even post <keypress F5> into the event queue.. Does

anyone have an example?

There's another problem. I'm told that on a Windows desktop, "Refresh

OPI" (either F5 or right-click menu) does _not_ cause the widget to

update. However, closing and reopening the OPI does.

Q2: would it be possible to script a close/reopen of an opi (to come

back in the same place) ?

.. In both cases, I've experimented with a few script options, but can't

find the right method to call.

Thanks

--
Peter Milne
Director of Sales
www.d-tacq.com

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System